import router from './router'
import store from './store'
import { Message } from 'element-ui'
import NProgress from 'nprogress' // progress bar
import 'nprogress/nprogress.css' // progress bar style
import { getToken } from '@/utils/auth' // get token from cookie
import getPageTitle from '@/utils/get-page-title'

NProgress.configure({ showSpinner: false }) // NProgress Configuration

const whiteList = ['/login'] // no redirect whitelist

router.beforeEach(async (to, from, next) => {
    // start progress bar
    NProgress.start()

    // set page title
    document.title = getPageTitle(to.meta.title)

    // determine whether the user has logged in
    const hasToken = getToken()
    
    if (hasToken) {
        if (to.path === '/login') {
            // if is logged in, redirect to the home page
            next({ path: '/' })
            NProgress.done()
        } else {
            const hasGetUserInfo = store.getters.name
            if (hasGetUserInfo) {
                next()
            } else {
                const hasRoles = store.state.user.roles && store.state.user.roles.length > 0
                if (hasRoles) {
                    next()
                } else {
                    try {
                        // get user info
                        // note: roles must be a object array! such as: ['admin'] or ,['developer','editor']
                        const { roles } = await store.dispatch('user/getInfo')

                        // generate accessible routes map based on roles
                        const accessRoutes = await store.dispatch('permission/GenerateRoutes', roles)

                        // dynamically add accessible routes
                       router.addRoutes(accessRoutes)

                        // hack method to ensure that addRoutes is complete
                        // set the replace: true, so the navigation will not leave a history record
                        if(accessRoutes.length > 1){
                            next({ ...to, replace: true })
                        }else{
                            next()
                        }
                    } catch (error) {
                        // remove token and go to login page to re-login
                        await store.dispatch('user/resetToken')
                        Message.error(error || 'Has Error')
                        next(`/login?redirect=${to.path}`)
                        NProgress.done()
                    }
                }
            }
        }
    } else {
        /* has no token*/

        if (whiteList.indexOf(to.path) !== -1) {
            // in the free login whitelist, go directly
            next()
        } else {
            // other pages that do not have permission to access are redirected to the login page.
            next(`/login?redirect=${to.path}`)
            NProgress.done()
        }
    }
})

router.afterEach(() => {
    // finish progress bar
    NProgress.done()
})
